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Child Height Predictor

Illustration of child being measured for height

Child's sex

2 years

Child's height *

ft.

in.

Child's weight *

lbs.

Mother's height *

ft.

in.

Father's height *

ft.

in.

Curious to find out how tall your child will be when they grow up? We can't see the future, but with a little math and science, we can make a pretty good guess about how tall they'll be when they're 18 – with a margin of error under 2 inches.

This calculator works for children age 2 and up. (Depending on your child's age, we'll use some or all of the information you entered in our calculations.) You may get inaccurate results for children who are exceptionally tall or are already taller than both their parents.

The Height Predictor is meant to be a fun tool, and doesn't guarantee your child will be this height when they grow up. If you're concerned about your child's growth, talk to their healthcare provider.

How to tell how tall your child will be

There are a few different methods of predicting how tall your child will be when they grow up. Our Child Height Predictor tool uses the Khamis-Roche method, which is based on a study conducted in the 1990s with about 400 participants.

The method takes a child's height, weight, and the average height of their parents, then uses ratios to determine how to calculate the child's predicted height at age 18. A previous method also used the child's skeletal age, which is how mature a child's bones are and requires an X-ray. But the Khamis-Roche researchers wanted to find a way parents could predict their child's height without having to get an X-ray taken.

If you want to test out other ways to predict your child's height at home, these are a couple methods you can try:

Two years times two

Children grow a ton in their first few years of life – in fact, their first growth spurt from baby to toddler accounts for about half of their adult height. One simple way to predict how tall your child will be when they grow up is to take their height at age 2 if they're a boy or 18 months if they're a girl and double it. (Girls grow a little faster than boys.)

This method has been around for a long time, but there isn't any scientific research about how accurate it is.

Mid-parental method

Another way to estimate your child's adult height is to add together the height of both parents and divide it by two.

Then, some methods say to add 5 inches if they're a boy and subtract 5 inches if they're a girl; others say to only add or subtract 2 ½ inches. There's a high margin of error with this method – it could be off by 4 inches.

Sources

BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals. We believe you should always know the source of the information you're seeing. Learn more about our editorial and medical review policies.

American Academy of Pediatrics. 2016. Predicting a Child's Adult Height. https://www.healthychildren.org/English/health-issues/conditions/Glands-Growth-Disorders/Pages/Predicting-a-Childs-Adult-Height.aspx [Accessed June 2022]

Mayo Clinic. 2022. What's the best way to predict a child's adult height? https://www.mayoclinic.org/healthy-lifestyle/childrens-health/expert-answers/child-growth/faq-20057990 [Accessed June 2022]

U.S. Centers for Disease Control and Prevention. 2017. Clinical Growth Charts. https://www.cdc.gov/growthcharts/clinical_charts.htm [Accessed June 2022]

Harry Khamis. 2001. Stature Prediction. http://www.wright.edu/~harry.khamis/stature_prediction/ [Accessed June 2022]

Rebekah Wahlberg
Rebekah Wahlberg is an associate editor at BabyCenter, the world's number one digital parenting resource. She lives in Southern California with her silly dog Booger, where she enjoys hiking, yoga, and watching Netflix when she "should" be reading. Wahlberg is passionate about creating content that helps parents and parents-to-be equip themselves with everything they need to succeed.

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